JPH0226005Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a stroke detection device that operates a switch when the stroke of the output shaft of a door opening/closing cylinder exceeds a predetermined value, and detects that the stroke has exceeded a predetermined value.

Conventionally, this type of stroke detection device includes a switch attached to the main body of an actuating cylinder, and a cam surface whose one end is swingably supported by the output shaft of the actuating cylinder and whose other end operates the switch. and a guide device that guides the axis of the switch operating rod to a predetermined position in the radial direction with respect to the operating cylinder, and when the output shaft exceeds a predetermined value, the switch moves together with the output shaft. A switch has been proposed in which the switch is operated using the cam surface of the operating rod.

By the way, in the conventional stroke detection device for the door opening/closing cylinder, one end of the switch operating rod is swingably supported with respect to the output shaft of the operating cylinder, so the switch operating rod is not aligned with the axis of the cylinder. It can swing freely against the
If the guide hole of the guide device that guides the switch operating rod to a predetermined position in the radial direction relative to the operating cylinder is tilted to some extent with respect to the switch operating rod, the stroke of the operating cylinder for opening and closing the door will be relatively long. There is a disadvantage that the sliding surface wears out significantly due to the biased force generated between the switch operating rod and the guide hole, and if the axial length of the guide hole sliding surface is shortened in order to reduce the biased force mentioned above, Since the sliding surface became smaller, it also had the disadvantage that the sliding surface wore out quickly.

The present invention has been made in view of the above-mentioned problems, and aims to provide a stroke detector for a door opening/closing cylinder that has a simple structure and good durability. The output shaft and the switch operating rod are connected to each other with a degree of freedom in the radial and axial directions of the switch operating rod, and the guide device is fixed to the main body at one end and has a support hole at the other end. and a groove portion on the outer periphery that fits into the support hole with a gap,
and a guide member having a guide hole formed therein to slidably fit into the sliding portion of the switch operating rod.

As a result, the present invention has the following effects.

The connection part between the switch operating rod and the output shaft is provided with a degree of freedom in the radial and axial directions of the switch operating rod to allow relative rocking or fluctuation between the output shaft and the switch operating rod, and the switch operation In the rod guide device, the groove of the guide member is fitted into the support hole of the support member with a gap, so that relative rocking or fluctuation between the guide member and the support member is allowed. Even if the shaft swings in relation to the door, the switch operating rod is allowed to freely fluctuate without causing biased forces on the switch operating rod or guide members, improving durability and reducing stroke. Detection can be performed stably.

The connection part of the switch operating rod to the output shaft and the guide part of the guide device are configured to have degrees of freedom, and the structure for realizing this is easy.
The structure is simple.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram showing the entire embodiment of the present invention, and FIG. 2 is a partially enlarged view of FIG. 1.

In FIG. 1, the operating cylinder, designated as a whole by 1, has an input port 3 connected to a pressure source at the rear of its main body 2, and a solenoid valve 4 which is energized and deenergized according to the operation of a door opening/closing switch (not shown). The output shaft 5 is connected to the door via a connecting device attached to the yoke 6 (both not shown). 7 is a dust cover installed between the main body 2 and the output shaft.

8 is a switch operation stick, and its left end is
Support plate 10 screwed onto yoke 6 with machine screws 9
The switch is fitted into the fitting hole 11 with a gap, and on both sides of the support plate 10 of the switch operating rod 8,
Locking members 12 and 13 are bolts 14 and 15
The distance between the right end of the locking member 12 and the left end of the locking member 13 is slightly larger than the thickness of the support plate 10.
Therefore, the switch operating rod 8 is swingable relative to the support plate 10. Further, a cam surface 17 for driving the switch 16 is formed at the right end of the switch operating rod 8, and the switch 16 is attached to the main body 2 by a machine screw 18.
It is attached to a support member 19 fixed by bolts or the like.

As shown in FIG. 2, a support hole 20 is provided below the left end of the support member 19, and within the support hole 20 is a synthetic resin having a flange portion 21 and a body portion 22 whose outer diameter is slightly smaller than that of the support hole 20. A guide member 23 made of resin is fitted and prevented from coming off by a retaining ring 24, and a switch operating rod 8 is disposed inside the guide member 23.
A guide hole 26 is provided which is slidably engaged with the sliding portion 25 of. Then, the flange portion 21 and the retaining ring 24
The body 22 between the support member 19 and the guide member 23 forms a groove 27 on the outer periphery of the guide member 23.
The guide device 28 is constituted by the above.

The operation, etc. of this embodiment configured as above will be explained.

Now, when the door opening/closing switch is operated to close the door, compressed air is supplied to the operating cylinder 1 via the solenoid valve 4, the output shaft 5 moves to the left, and the door begins to close. At the same time, the support plate 10 moves to the left, so that the left side of the support plate 10 comes into contact with the right end surface of the locking member 12 fixed to the switch operation rod 8, and then the switch operation rod 8 is moved to the left. let
At this time, the guide member 2 that guides the switch operating rod 8
3, the flange 21 is joined to the right side of the support member 19, so the sliding portion 25 of the switch operating rod 8 slides and moves relative to the guide hole 26. Note that since there is a gap between the support hole 20 and the groove portion 27, the flange 21 can move along the support member 19, thereby allowing the guide hole 26 of the guide member 23 to move.
is easily concentric with the sliding portion 25 of the switch support member 8, and no flattening force or twisting occurs between the two.

When the output shaft 5 moves a predetermined distance and the door is about to close, the cam surface 17 of the switch operating rod 8
The switch 16 is actuated by the switch 16 to notify the driver etc. that the door will be closed.

Next, when the door opening/closing switch is operated to open the door, the compressed air supplied to the operating cylinder 1 is exhausted from the solenoid valve 4, and the output shaft 5 moves to the right. Therefore, the right surface of the support plate 10 comes into contact with the left end surface of the locking member 13, thereby moving the switch operating rod 8 to the right. When the switch operating rod 8 begins to move to the right, the guide member 23 moves due to sliding wear with the switch operating rod 8 until the retaining ring 24 comes into contact with the left side of the support member 19, and then the switch is operated. The sliding part 25 of the rod 8 is the guide member 2
It slides and moves with respect to the guide hole 26 of No. 3. Note that even if the retaining ring 24 of the guide member 23 partially hits the left side of the support member 19, the support hole 20
Since the axial length of the guide hole 26 can be made sufficiently long with respect to the diameter of the guide hole 26, a large biasing force is not generated.

[Brief explanation of the drawing]

FIG. 1 is an overall view showing an embodiment of the present invention, and FIG. 2 is a partially enlarged view of FIG. 1. DESCRIPTION OF SYMBOLS 1... Operating cylinder, 2... Main body, 5... Output shaft, 8... Switch operating rod, 10... Support plate, 1
1... Fitting hole, 12, 13... Locking member, 16...
...Switch, 17...Cam surface, 19...Support member, 20...Support hole, 23...Guide member, 25...
...Sliding part, 26...Guide hole, 27...Groove part, 28
...Guidance device.

Claims (1)

[Scope of utility model registration request] a switch attached to the main body of an operating cylinder; a switch operating rod having one end slidably supported on the output shaft of the operating cylinder and having a cam surface at the other end for operating the switch; and the switch operating rod. In the stroke detection device for a door opening/closing actuating cylinder, the stroke detecting device includes a guide device that guides the axis of the actuating cylinder to a predetermined position in the radial direction with respect to the actuating cylinder. and a support member fixed to the main body at one end and having a support hole at the other end, and a groove portion that fits into the support hole with a gap. A stroke detecting device for a door opening/closing actuating cylinder, which has a guide member on the outer circumference and having a guide hole formed therein to slidably fit into the sliding portion of the switch operating rod.